Ore-roasting furnace.



Patented Nov.22, 1910.

2 SHEETS-SHEET 2.

J. B. F. HBRRESH'OPF.. OBE ROASTING PURNAGE. APPLIQIOATION FILED JULY20, 1909.

ATTORNEYS l/WENTR 79.75%

:mw-mn JOHN B. F. HERRESHOFF, OF NEW YORK, N. Y., ASSIGNOR TO NICHOLSCOPPER C0., OF NEW YORK, N. Y., A CORPORATION OF NEW-YORK.

onn-nonsrme scannen.

Specification of Letters Patent. Patented NOV. 22, 1910.

Application led July 20, 19Q9. Seria1-No. 508,598.

` To all 'whom it may concern:

Be it known vthat I, JOHN B. FRANCIS HERREsHorF, a citizen of the UnitedStates,

and resident of the borough of Manhattan, city, county, and State. ofNew York, have invented certain new and useful Improvements inOre-Roasting Furnaces, of which the following is a specification.

My invention relates to furnaces for roasting fine ores and has for itsobject to improve the construction of a type disclosed in patentspreviously granted to me, particularly as to meansfor increasing thelife and efficiency of the apparatus by proper cooling arrangements.

'A specific embodiment of my invention is illustrated in theaccompanying drawings,

' in which- Figure 1 is a vertical section of an ore roastlng furnacecontaining my improvements; Fig. 2 is a vertical section drawn upon anenlarged scale showing one of the stirrer or rabble arms; Fig.l 3 is ahorizontal section on line 3--3v of Fig. 2; Fig. 4 is a horizontalsection on line 4;-4 of Fig. 2 and Figs. 5 and 6 are views takensubstantially on lines 5 5 and 6-6 of Fig. 2.

The body or frame A of the furnace is provided ywith a series ofsuperposed floors B-C, which are provided laterally with centralopenings B and peripheral openings C. The ore is delivered to theuppermost floor B through chutes D leading from cylindrical chambers Ereceiving a supply from hoppers F. .The ore is fed in the chambersE bymeans of screw conveyers G,

mounted upon a shaft G, which is driven by means of gearing G2. By meansof rabble arms of a type now well-known in the art, the ore is crowdedlaterally' inward to the openings B and outward to the openings C 'andtravels downward while the roasting driven by suitable mechanism such asthe gearing H3. A gear J2 is connected with the upper portion of thesleeve J and serves through the medium of the gear G2 to op- 5. Theseerate the screw conveyers G. To the sleeve J are secured as by means ofbolts and nuts K the rabble arms L. Each of these arms is preferablyprovided at its inner end with a flange L', fitted against acorresponding flange J3 of the sleeve J, and furthermore the rabble armis divided internally by a partitlon L2 Into two channels, of which theupper channel L3 communicates with the interior of the sleeve J by meansof an aperture J 4 while the lower channel L4 nicates withlthe interiorof the shaft H by means of a nipple or tube M inserted into a suitableaperture of the shaftand extending therefrom outwardly through asuitable aperture of a sleeve to form a tight joint with the innersurface of the rabble arm. i

,Air is supplied by means of a blower or other suitable device through apipe N connected with the lower end :of the shaft H and this air passesthrough the several nip? ples `M to the channels L* Iand L3, cooling therabble arms and the shaft and finally escapes through the sleeve J andthe stationary pipe O connected with the upper end thereof.

As shown in'the drawings,` the lowermost rabble arms Zneed not beprovided with the air circulating means described above.

The projections B carried by the rabble arms are inclined alternately tothe left and to the' right in adjacent arms so as to alter- 'natelyforce the ore inward and outward on the several oors in the well-knownmanner. I prefer to attach these rabble arms to movab e sections Q, eachcarryin three orv four `such projections and provide with suitable meansfor temporary attachment such as the overlappin hooks Q. shown in Figs.3 and iooks lit over flanges Ls of the rabble arms and each section Qmay therefore be slid lengthwise of the rabble arm, thus facilitatingthe insertion and remova'l of the sections carrying the projections I.v

Nuts and bolts, as indicated at R, or any other suitable means may beemployed for preventing accidental movement o f the sec-. tions Q,during the normal o eration of the furnace. I have also indicate in Fi 1pipe sections Sarranged at the center of t e oors C, which pipe sectionsare overlapped by 1nverted cups 'I shown also in Figs. 2 and 3. Theseparts of the furnace are provided ,for the passage of air through it atthe begmning of the operation, 'but as soon as the ore` descends to thesuccessive floors C, it rises above the level of the inverted cups Tand: forms a seal therefor.

Iclaim as my invention:

1. An ore-roasting furnace comprising a casing with superposed floors, ahollow upright shaft in said casing, a sleeve surround- 'in said shaftand connected therewith, and

ra blearms held to rotate with said shaft and located entirelyexteriorly thereof, said rabble arms being provided with interiorchannels communicatingwith the interior of the shaft and sleeverespectively.-

2.' In a furnace the combination of the casing, a hollow sha-ft therein,a sleeve connected with the shaft and a rabble arm held.

connected with the shaft and projecting l through the body atthe endopposite to the shaft, driving means connected with the projectingportion of the shaft driven mechanism connected with the .projectingportion of the sleeve for operating said feeding mechanism, and rabblearms provided with internal cooling channels connected at one end withthe interior of the shaft and at the other end with the interior of thesleeve.

4. The combination of theA body or casing, the hollow shaft extendingtherein, the sleeve connected with the shaft and rabble arms mounted toturn with the shaft and located entirely eXteriorly thereof, said rabblearms being provided. with superposed channels; communicating witheachother at their outer ends, the. inner ends of said channelscolnmunicating respectively with the interior of the shaft and with theinterior of the sleeve.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

J. B. F. HERRESHOFF. Witnesses:

JOHN A. KEHIENBEGK, FRITZ ZIEGLER, Jr.

